Dental articulator.



D. n. CAMPBELL.

DENTAL ARTICULATOR..

APPLICATION FILED OCT. 7. 191By 9,301,817., Patented Apr. 29, 1919.

Ua @7726 772 @L wZL-N W EY D. D. CAMPBELL.

DENTAL ARTICULATOR.

APPucATloN FILED ocr. 1. 191s,

l ,SG1 ]i Patented Apr. 29, 1919.

' 3' 2 SHEETSHSHEET 2.

DENTAL .ARTICULATOIR inserer?.

To all 'whom t may concern Be it known that I, DAYTON D. CAMPBELL, acitizen of the United States, residing at Kansas City, in the county ofJackson and State of Missouri, have invented certain new and usefulImprovements in Dental Articulators, of which the following is aspecification.

This invention relates to artificial tooth articulators and is designedmore especially as an attachment foi or improvement in the well knownGysi simplex artikulator or any other anatomical articulator, thespecial object of the invention being to produce an articulator in whichthe tooth cusp is utilized as the guiding factor in mandibularmovements, thusV ignoring condyle devices and avoiding preliminaryadjustments for the accommodation of individual cases, and provideddentures -which determine the niandibular movement as distinguished fromai'ticulators which provide dentures to conforni to individual condylepath movements. A further object is to produce an articulator whichmakes provision for the anteroposterior movement of the lower` jaw, and

for the prevention of ,injury to the teeth during thev process ofgrinding them.

With these general objects in view, the invention consists in certainnovel and use ful features of construction and combinations of parts ashereinafter described and claimed; and in order that it may be fullyunderstood reference is to be had to the accompanying drawings, inwhich:

Figure 1, is a top plan view of an artificial tooth articulatorembodying my improvenients.

Fig. 2, is a central vertical section of the same.

Fig. 3, is a front view of the saine.

Fig. t, is a horizontal section of the same.

In the said drawing, where like reference characters refer tocorresponding parts, 1 indicates a base plate upon a frame having tworear supporting legs 2, and provided at its front end with alongitudinally eX- tendiiig Vshaped guide 3 having vertical wall edgesor guards l, and provided at its rear end with rearwardly projectingguide pins 5 and a screw 6 midway between said pins, the screw beingupset at the front end at 7 to prevent disengagement from the base.

An upright skeleton frame is mounted slidingly on said pins and isadjustable back and forth by said screw 6. Said frame is Specificationof Letters Patent.

' Application filed October 7, 1918.

Patented Api. 29, 1919..

Serial No. 257,104.

substantially rectangular in form and comprises a lower cross bar 8through which the pins and screws extend, a pair of standards 9extending divergeiitly upward and leaning slightly rearward, and a topcross bar 1() connecting the standards and provided near its ends withupwardly projecting pins ll, rearwardly facing walls 12 and a springarm13.

A movable member of substantially T shape in plan view, comprises thecross-head 141 and the forwardly projecting stein 15, and the latter isprovided with a depending finger 1G engaging the guide 3, and isequipped with a rearwardly projecting indicator 17. The cross-head 14has a central downwardly and rearwardly sloping or inclined face 18engaged by the overlying free end of the spring-arm 13. Said cross-head14 is also provided at its ends with a pair of forwardly and downwardlysloping cam lugs 19 litting upon pins 11 and with a pair of verticalshoulders 2O flanking the inner sides of said pins. The cross-head isfurthermore provided with a pair of pins 21 extending downwardly andforwardly against the rearwardly-facing walls 12 of cross bar 10 of theupright frame.

The stem 15 is of sectional construction, that is to say the front ormajor portion of the stem is provided with a pair of rearwardlyprojecting pins 22 engaging forwardly projecting socket arm 23 of thecross-head 111, and to secure the stem sections rigidly together whenthe desired adjustment is attained, clamping screws 211 are mounted inthe socket arms 23 and impinge upon the pins 22.

From the foregoing it will be seen that by loosening clamping screws 241and then turning screw 6 in the proper direction, the articulator can belengthened or shortened between tlie finger 16 and the upright frame,and secured rigidly in such adjustment by screwing home the set screws2li. By means of gypsum indicated by dotted lines 25 the row of teeth 26for the lower jaw, is secured in position. Gypsum indicated by dottedlines at 27 is also employed for securing the row of teeth 28 for theupper jaw, in position. The gypsum indicated at 25 being secured in thecustomary manner to the base plate, and the gypsum indicated at 27 tothe stem of the Tshaped frame 15, which frame can be raised and loweredupon the pins 21 as the axis of movement.

I/Vith the Gysi articulator shallow cusps are produced anld theserestrict the mandbular movement of the jaws t-o an undesirable extent.I/Vith my attachment the teeth can be ground to give harmonious andsynchronous contact for all the teeth and at the same time accommodateunrestricted mandbular or jaw movement, and hence the same eiiicientservice as perfect and natural teeth. It is possible to so grind theteeth because the guide 3 for linger 1G insures the producing of deepcusps, and the adj ustability of the lower or base member independent ofthe upper jaw or hinged member enables the operator to set the teeth inposition to bite accuratel i and then grind them to reduce the highpoints until harmonious and synchronous contact is obtained, thegrinding action being accomplished by applying lateral pressurealternately on opposite sides of the guide lingers, and in this action,as will be apparent, the extensions of the wall of the guide preventaccidental disengagement of the pin from the guide and the possibilityof chipping the :front teeth or the incisors.

In the grinding action, the pins 2l alteri nately form pivotal pointshaving slight arcuate movement on shoulders l2, and the pins ll and camlugs/ 19important elements in the operation of the Gysi articulator-arefunctionless. The indicator 17 in conjunction with the scale points 29on arms l0, performs their usual function, as gages in the propersetting of the rows of teeth in the articulator. The screw G enables theoperator to obtain the most accurate of ad-v justments in grinding theadjacent faces of cuspid and bicuspid teeth.

From the above description it will be apparent that I have produced anarticulator possessing the features of advantage set forth in thestatement of the object of the invention, and which may be modilied inminor particulars without departing from the principle of constructioninvolved or `the scope of the appended claims.

standard having widely spaced rearwardly.

facing shoulders, a base plate slidingly connected forback-and-forthmovement, to the standard and supporting the latter, and provided at thefront end with a longitudinal guide of V form in cross section, a setscrew mounted in the base plate and engaging the standard in thelongitudinal plane of said guide, a horizontally-arranged T-shapedmember overlying the standard and base plate and provided at the ends ofits head with pins depending onto the top of the standard and engagingthe rearwardly-facing shoulders thereof, and with a depending fingerresting on said V-shaped guide, and a spring applying downward pressureon the head of the T-shaped member to hold the same yieldinglydepressed.

2. A dental articulator comprising a standard'having widely spacedrearwardlyfacing shoulders, a base plate slidingly connected to thestandard and supporting the latter, and provided at the front end with alongitudinal guide of V-form in cross-sec.- tion, the sides of saidguide having parallel extensions projecting vertically upward, means foreffecting baclr-and-forth adjustment of said standard relative to saidbase, a horizontally arranged T-sha-ped member overlying the standardand base plate'and provided at the ends of its head with pins dependingonto the top of the standard and engaging the rearwardly-facingshoulders thereof, and with a depending nger resting on said V-shapedguide, and a spring apply ing downward pressure on the head of theTeshaped member to hold'the same yieldingly depressed.

`In testimony whereof I aix my signature.

DAYTON D. CAMPBELL.

Gopes o! this patent may be obtained for ve cents each, by addressingthe "Commissioner of Patents, Washington, D. G.

